Pacific Pests, Pathogens & Weeds - Mini Fact Sheet Edition

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Sorghum streaky spot (073)

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Photo 1. Early symptoms of sorghum streaky spot, Xanthomonas vasicola pv. holcicola, showing reddish-brown short rectangular spots.

Photo 2. Early infection: small oval to rectangular reddish-brown spots of Xanthomonas vasicola pv. holcicola.

Photo 3. Infection of sorghum by streaky spot, Xanthomonas vasicola pv. holcicola. As the leaves age, so the spots enlarge and some join together. The stems are also infected.

Photo 4. Majority of leaves of sorghum infected by streaky spot, Xanthomonas vasicola pv. holcicola;  those at the base have withered and died. Note the large blotches on the stems.

Summary

• Worldwide distribution. On sorghum, millet and Johnson grass. Relatively minor importance.
• Reddish-brown, somewhat rectangular spots (streaks) up to 3 mm wide and 15 mm long on the lower leaves, moving progressively upwards. Streaks merge in wet weather, causing a blight. Large blotches occur on leaf bases and stems.
• Cultural control: avoid planting successive crops on the same land; use “clean” seed, i.e., from healthy crops; collect trash and burn after harvest.
• Chemical control: none recommended.

Common Name

Sorghum streaky spot, bacterial leaf streak

Scientific Name

Xanthomonas vasicola pv. holcicola; previously, Xanthomonas campestris pv. holcicola.

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